Today in History

September 24, 1906

The First National Monument

The 1859 Yellowstone Expedition first reported the find of an amazing rock formation, known by local Native Americans as the "Bear's Lodge". On September 24, 1906, President Theodore Roosevelt proclaimed Devils Tower, Wyoming the first National Monument of the United States. The tower is an igneous (fire formed) intrusion of rock from which the surrounding, softer materials have eroded. The monolith may be a volcanic plug from a long-ago disappeared volcano.

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